Mg-pair isoelectronic bound exciton identified by its isotopic fingerprint in Si28
Mg-pair isoelectronic bound exciton identified by its isotopic fingerprint in
Si28
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通过 Si28 中的同位素指纹识别镁对等电子束缚激子
DOI：
10.1103/physrevb.98.205203
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发表时间：
2018
影响因子：
3.7
通讯作者：
M. Thewalt
中科院分区：
文献类型：
--
作者：
Rohan J. S. Abraham;Adam DeAbreu;K. Morse;V. Shuman;L. Portsel;A. Lodygin;Y. Astrov;N. Abrosimov;S. Pavlov;H. Hubers;S. Simmons;M. Thewalt
我们利用高丰度硅提供的极大改善的光学线宽，研究了先前在掺镁天然硅的发光光谱中观察到的1017 meV附近的光致发光线，认为这是由于位于镁对中心的等电子束缚激子的复合所致。在Si中发现这条非声子线由五个组分组成，它们的相对强度与镁的三个稳定同位素随机组合形成的镁对的相对丰度非常接近，从而证实了镁对假说。我们进一步介绍了这个中心的温度依赖研究结果，揭示了不寻常的和尚未解释的行为。
We use the greatly improved optical linewidths provided by highly enriched $^{28}$Si to study a photoluminescence line near 1017 meV previously observed in the luminescence spectrum of natural Si diffused with Mg, and suggested to result from the recombination of an isoelectronic bound exciton localized at a Mg-pair center. In $^{28}$Si this no-phonon line is found to be comprised of five components whose relative intensities closely match the relative abundances of Mg-pairs formed by random combinations of the three stable isotopes of Mg, thus confirming the Mg-pair hypothesis. We further present the results of temperature dependence studies of this center that reveal unusual and as yet unexplained behaviour.